Granted Patent
Utility
US 5,081,220 · App. 07/315,649
Copolyesters of 4,4'-biphenyldicarboxylic acid, 1,4-butanediol and ethylene glycol
Inventors:
John C. Morris, Winston J. Jackson, Jr.
Patented Case
View Patent ↗
Granted: Jan 14, 1992
Filed: Feb 27, 1989
Inventors
John C. Morris
Winston J. Jackson, Jr.
Assignee (at issue)
EASTMAN KODAK COMPANY
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.